Solder.



Patented August is, 1903.

PAT NT OFFICE.

RUDOLF BORMANN, or BERLIN, GERMANY.

SOLDER.

SPECIFICATION forming part of Letters Patent No. 736,812, dated August 18, 1903. Application filed March 6, 1903. Serial No. 146.580. (No specimens.)

To all whmnxit may concern: f

Be it known that 'I, RUDOLF BRMANN,a subjectof the King of Prussia, German Em: peror, residing at Rixdorf, Berlin, Germany, have invented certain new and useful Imf provements in Solder, of which the following is a specification. I

Myinvention relates to compositionsfor solder. i

It has for its object to provide a compound adapted for this purpose which can be more I economically and conveniently applied than those at present in use. will'be hereinafter pointed out.

The nniting of metal objects by means of soft solder has hitherto been accomplished by first cleansing the portions to be united-for example, two metal bodies-by means of known deoxidizing agent-68 g., zinc chlorid or the like-=-and then heating the same with a? soldering iron, applying the solder to the seam, and melting the same. With this operation which has beenin use for years, there are connected certain disadvantages--viz., the

following: First, it is not possible to employ; merely the exact quantity of solder necessary to effect the soldering, since in the soldering process a considerable excess of solder is al-; ways melted and drops oiflwhich causes a:

great lossof solder, and it is evident that in consequence thereof an even distribution of the solder upon the parts to be united is im-. possible. A further disadvantage which comes especially into question for fine mechanics is that soldering-irons cannot be employed for.

manipulating small objects,and spirit or similar lamps must be employed, so that the solder stick, which always takes up a space many times as great as the objects to be united, cannot be brought close to the small articles to be soldered, and, moreover, these objects are spoiled by the melting solder. Consequently a need has for a long time been felt for a soldering agent obviating these disad-l vantages which may be spread upon the surfaces to be soldered and can be used merely in the necessary quantity.

The soldering agent forming the subject of the present invention consists of an intimate These advantages mixture of finely-powdered soft solder-tin, alloy, or the Iiketriturated toa paste, a deoxidizing agent-e. g., zinc'chlorid, ammonium chlorid, or both together-and a thickening bodysuch, for example, as cellulosewhich burns easily and leaves no trace behind it. This complies with the necessary requirements, since a soldering material is thus obtained which can be spread on in aform hitherto unknown as a pasty fluid and has this striking advantage that it can be applied to the object to be soldered by means of a brush, so that there is a guarantee that the soldering material will be applied in the necessary quantity and will be very evenly distributed over the parts to be soldered. By this means these parts may be securely and intimately connected by simply heating them over 'a spirit or similar lamp. A further striking advantage of employing such a pasty fluid softsolder material is that in a space of time incomparably shorter than what was hitherto possible quite a number of objects-particularly small objectscan be simultaneously soldered. One proceeds by first applying the soldering material with a brush to the articles to be soldered and then heating them one after another overa spirit-flame or the like. Also if on one article there are several places to be may be given the fact that a spiral if provided with a layer of this material can be converted to a closed tube, since the solder is evenly distributed between the coils of the spiral and intimately secures the same one to another.

What I claim, and desire to secure by Letters Patent of the United States, is-- 1. Aliquid soft-soldering mass consistingof a mixture of a finely-pulverized soft-solder In testimony whereof I have hereunto set my hand in the presence of two witnesses.

RUDOLF BORMANN.

Witnesses:

HUGO NELSON, JACOB CALLMAN. 

